<article id="wikiArticle">
<div></div>
<h2 id="Summary" name="Summary">概述</h2>
<p><code><strong>toString()</strong></code> 方法返回当前 symbol 对象的字符串表示。</p>
<h2 id="Syntax" name="Syntax">语法</h2>
<pre><code class="language-javascript"><var>symbol.toString()</var>;</code></pre>
<h2 id="Description" name="Description">描述</h2>
<p><a href="Reference/Global_Objects/Symbol" title='Symbol()函数会返回symbol类型的值，该类型具有静态属性和静态方法。它的静态属性会暴露几个内建的成员对象；它的静态方法会暴露全局的symbol注册，且类似于内建对象类，但作为构造函数来说它并不完整，因为它不支持语法："new Symbol()"。'><code>Symbol</code></a> 对象拥有自己的 <code>toString</code> 方法，因而遮蔽了原型链上的 <a href="Reference/Global_Objects/Object/toString" title="toString() 方法返回一个表示该对象的字符串。"><code>Object.prototype.toString()</code></a>。</p>
<h3 id="symbol_原始值不能转换为字符串">symbol 原始值不能转换为字符串</h3>
<p>symbol 原始值不能转换为字符串，所以只能先转换成它的包装对象，再调用 <code>toString()</code> 方法：</p>
<pre><code  class="language-javascript">Symbol("foo") + "bar";      
// TypeError: Can't convert symbol to string
Symbol("foo").toString() + "bar"
// "Symbol(foo)bar"，就相当于下面的:
Object(Symbol("foo")).toString() + "bar"
// "Symbol(foo)bar"
</code></pre>
<h2 id="示例">示例</h2>
<pre><code  class="language-javascript">Symbol("desc").toString();   // "Symbol(desc)"

// well-known symbols
Symbol.iterator.toString();  // "Symbol(Symbol.iterator)

// global symbols
Symbol.for("foo").toString() // "Symbol(foo)"
</code></pre>
<h2 id="规范">规范</h2>
<table class="standard-table">
<tbody>
<tr>
<th scope="col">Specification</th>
<th scope="col">Status</th>
<th scope="col">Comment</th>
</tr>
<tr>
<td><a class="external" href="https://www.ecma-international.org/ecma-262/6.0/#sec-symbol.prototype.tostring" hreflang="en" lang="en" rel="noopener">ECMAScript 2015 (6th Edition, ECMA-262)<br/><small lang="zh-CN">Symbol.prototype.toString</small></a></td>
<td><span class="spec-Standard">Standard</span></td>
<td>Initial definition.</td>
</tr>
</tbody>
</table>
<h2 id="浏览器兼容性">浏览器兼容性</h2>
<p></p><div class="blockIndicator warning"><strong><a class="external" href="https://github.com/mdn/browser-compat-data" rel="noopener">We're converting our compatibility data into a machine-readable JSON format</a></strong>.
            This compatibility table still uses the old format,
            because we haven't yet converted the data it contains.
            <strong><a class="new" href="/zh-CN/docs/MDN/Contribute/Structures/Compatibility_tables" rel="nofollow">Find out how you can help!</a></strong></div>
<div class="htab">
<a id="AutoCompatibilityTable" name="AutoCompatibilityTable"></a>
<ul>
<li class="selected"><a>Desktop</a></li>
<li><a>Mobile</a></li>
</ul>
</div><p></p>
<div id="compat-desktop">
<table class="compat-table">
<tbody>
<tr>
<th>Feature</th>
<th>Chrome</th>
<th>Firefox (Gecko)</th>
<th>Internet Explorer</th>
<th>Opera</th>
<th>Safari</th>
</tr>
<tr>
<td>Basic support</td>
<td><span style="color: #888;" title="Please update this with the earliest version of support.">(Yes)</span></td>
<td><a href="/en-US/Firefox/Releases/33" title="Released on 2014-10-14.">33.0</a> (33.0)</td>
<td><span style="color: #f00;">未实现</span></td>
<td><span style="color: #f00;">未实现</span></td>
<td><span style="color: #f00;">未实现</span></td>
</tr>
</tbody>
</table>
</div>
<div id="compat-mobile">
<table class="compat-table">
<tbody>
<tr>
<th>Feature</th>
<th>Android</th>
<th>Chrome for Android</th>
<th>Firefox Mobile (Gecko)</th>
<th>IE Mobile</th>
<th>Opera Mobile</th>
<th>Safari Mobile</th>
</tr>
<tr>
<td>Basic support</td>
<td><span style="color: #888;" title="Please update this with the earliest version of support.">(Yes)</span></td>
<td><span style="color: #888;" title="Please update this with the earliest version of support.">(Yes)</span></td>
<td>33.0 (33.0)</td>
<td><span style="color: #f00;">未实现</span></td>
<td><span style="color: #f00;">未实现</span></td>
<td><span style="color: #f00;">未实现</span></td>
</tr>
</tbody>
</table>
</div>
<h2 id="See_Also" name="See_Also">相关链接</h2>
<ul>
<li><a href="Reference/Global_Objects/Object/toString" title="toString() 方法返回一个表示该对象的字符串。"><code>Object.prototype.toString()</code></a></li>
</ul>
</article>